source: src/main/java/agents/anac/y2016/myagent/etc/negotiationStrategy.java@ 127

package agents.anac.y2016.myagent.etc;

import java.util.ArrayList;

import genius.core.Bid;
import genius.core.utility.UtilitySpace;

public class negotiationStrategy {
        private UtilitySpace utilitySpace;
        private negotiationInfo negotiationInfo;
        private double df = -1.0; // 割引率
        private double rv = 0.0; // 留保価格

        private boolean isPrinting = false; // デバッグ用

        public negotiationStrategy(UtilitySpace utilitySpace,
                        negotiationInfo negotiationInfo, boolean isPrinting) {
                this.utilitySpace = utilitySpace;
                this.negotiationInfo = negotiationInfo;
                this.isPrinting = isPrinting;
                rv = utilitySpace.getReservationValue();
        }

        // 受容判定
        public boolean selectAccept(Bid offeredBid, double time) {

                // 割引率を求める（discountFactorが使えないため）
                if (df == -1.0) {
                        double util = utilitySpace.getUtility(offeredBid);
                        double discounted = utilitySpace.discount(util, time);
                        df = Math.pow(discounted / util, 1 / time);
                        // System.out.println("util:" + util + "\tdiscounted:" + discounted
                        // + "\tdf:" + df);
                }

                try {
                        if (utilitySpace.getUtility(offeredBid) >= getThreshold(time)) {
                                return true;
                        } else {
                                return false;
                        }
                } catch (Exception e) {
                        System.out.println("受容判定に失敗しました");
                        e.printStackTrace();
                        return false;
                }
        }

        // 交渉終了判定
        public boolean selectEndNegotiation(double time) {
                if (getThreshold(time) < rv) {
                        return true;
                }
                return false;
        }

        // 閾値を返す
        public double getThreshold(double time) {

                /* 交渉戦略に基づきthreshold(t)を設計する */
                /* negotiationInfoから提案履歴の統計情報を取得できるので使っても良い */
                /* （統計情報についてはあまりデバッグできていないので，バグが見つかった場合は報告をお願いします） */

                double threshold = 0.95;
                double e = 0.01;

                threshold = 1.0 - Math.pow(time, 1 / e);

                ArrayList<Object> arrogants = negotiationInfo.getArrogants();

                if (arrogants.size() == 1) {
                        Object arrogant = arrogants.get(0);

                        double slant = negotiationInfo.getSlant(arrogant);
                        // System.out.println("---------------\nSlant: " + slant);

                        double rushValue = threshold * df * slant; // 強気＊強気(0.5は勝利確率)
                        double concedeValue = negotiationInfo.getAverage(arrogant)
                                        * Math.pow(df, time); // 弱気＊強気
                        // System.out.println("rushValue:" + rushValue);
                        // System.out.println("concedeValue:" + concedeValue);

                        if (concedeValue > rushValue) {
                                if (negotiationInfo.getOpponentBidNum(arrogant) < 70) {
                                        e = 0.5;
                                } else if (slant < 0.15) {
                                        if (df == 1.0) {
                                                e = 0.3;
                                        } else {
                                                e = 1.65;
                                        }
                                } else {
                                        e = 0.1;
                                }
                        }
                }

                threshold = 1.0 - Math.pow(time, 1 / e);

                // 例：
                ArrayList<Object> opponents = negotiationInfo.getOpponents();

                for (Object sender : opponents) {
                        // System.out.println("sender:" + sender);
                        // System.out.println("time:" + time);
                        // double m = negotiationInfo.getAverage(sender);
                        // double v = negotiationInfo.getVariancer(sender);
                        // double sd = negotiationInfo.getStandardDeviation(sender);
                        // System.out.println("ave:" + m + "\nvar:" + v + "\nsta:" + sd);
                        // System.out.println("AcceptedNum:" +
                        // negotiationInfo.getAcceptedNum(sender));
                        // System.out.println("ArrogantsNum:" + arrogants.size());
                }

                return threshold;
        }

}